[BE] fix: 리뷰 좋아요가 존재하거나 존재하지 않을 때 분기처리 수정 (#276)

* fix: 존재하거나 존재하지 않을 때 분기처리 수정

* refactor: 분기처리 orElseGet 으로 수정

backend/src/main/java/com/funeat/review/application/ReviewService.java

@@ -93,13 +93,17 @@ public void likeReview(final Long reviewId, final Long memberId, final ReviewFav
         final Review findReview = reviewRepository.findById(reviewId)
                 .orElseThrow(IllegalArgumentException::new);
 
-        final ReviewFavorite reviewFavorite = ReviewFavorite.createReviewFavoriteByMemberAndReview(findMember,
-                findReview, request.getFavorite());
+        final ReviewFavorite savedReviewFavorite = reviewFavoriteRepository.findByMemberAndReview(findMember,
+                findReview).orElseGet(() -> saveReviewFavorite(findMember, findReview, request.getFavorite()));
 
-        final ReviewFavorite findReviewFavorite = reviewFavoriteRepository.findByMemberAndReview(findMember, findReview)
-                .orElse(reviewFavoriteRepository.save(reviewFavorite));
+        savedReviewFavorite.updateChecked(request.getFavorite());
+    }
+
+    private ReviewFavorite saveReviewFavorite(final Member member, final Review review, final Boolean favorite) {
+        final ReviewFavorite reviewFavorite = ReviewFavorite.createReviewFavoriteByMemberAndReview(member, review,
+                favorite);
 
-        findReviewFavorite.updateChecked(request.getFavorite());
+        return reviewFavoriteRepository.save(reviewFavorite);
     }
 
     public SortingReviewsResponse sortingReviews(final Long productId,